PyUnicode_AsUnicodeAndSize()

This allows compiling extension modules with -Wswitch-enum on gcc.
Initial patch by Floris Bruynooghe.

retries in case of ECONNREFUSED.

once rather than limit ourselves to the default chunk size.

Patch by Stefan Behnel.

#4147: minidom's toprettyxml no longer adds whitespace around a text node when it is the only child of an element.  Initial patch by Dan Kenigsberg.

#13406: fix more deprecation warnings and move the deprecation of unicode-internal earlier in the code.

old Unicode API.

the raw stream instead of limiting itself to the buffer size.

To avoid a NotImplementedError('CreateSymbolicLinkW not found') error.